nice formation... but not very practical or safe to fly that close in microgravity with full thrust being applied. you would almost have to have a network linking all ships so that they all thrust at the same exact moment, and a computer making tiny thrusts to maintain position.
It's airshow pretty, and with conventional aircraft in atmospheric fight, it would be a good way to concentrate firepower on a large target. But in space, you don't really have to have your nose pointed at what your shooting, so wouldn't you want to have your ships dispersed a bit more for safety?
I'm just giving you a hard time. Nice pic, nice model.